EP3009717A1 - Preassembled exchangeable insert of a drill cleaning device - Google Patents

Abstract

The invention relates to a preassembled replacement insert of a drilling fluid device for connecting a stationary flushing pipe to a rotating flushing pipe of a borehole, comprising a mechanical seal arrangement (2) with a stationary sliding ring (20) and a rotating sliding ring (21), a first sliding ring carrier (3) on which the stationary sliding ring (20) is arranged, a second sliding ring carrier (4), on which the rotating sliding ring (21) is arranged, a connection component (5), which is adapted to connect the replacement insert to the stationary flushing pipe, and one in the axial direction ( XX) acting adjusting mechanism (6) with a screw (60) for changing an axial length (L1, L2) of the removable insert, wherein the screw (60) with the second Gleitringträger (4) is connected to the axial direction (XX) an adjustment of the second slide ring carrier (4), the mechanical seal assembly (2) and the first slide carrier (3) rela tively to the connection component (5).

Description

The present invention relates to a preassembled replacement insert of a drilling fluid device for connecting a stationary, non-rotating flushing pipe with a rotating flushing pipe, which is embedded in a borehole.

For drilling in the earth's crust, especially for raw materials, so-called "wash pipe arrangements" are used, in which a drill head is arranged at the end of a rotating tube. A flushing liquid is guided downwards through the tube into the borehole, which then emerges from the boring head and is returned to the earth's surface along the outer circumference of the rotating tube. A problem area in such borehole arrangements is a seal between a stationary flushing pipe and the rotating flushing pipe. In order to avoid any leaks in this seal between stationary and rotating flushing pipe, particularly from an environmental point of view, the most conservative possible solutions are used. A solution for sealing is, for example, a series connection of a plurality of stationary seals, such as stuffing box packings or lip ring seals. In case of failure of one of these stationary seals then secures the subsequent stationary seal. Due to the high loads during drilling, however, the service life of the individual stationary seals is very low. This makes it necessary that the stationary seals must be replaced after a short period of time. However, this leads to a standstill of the drilling rig and thus to high costs. Since the stationary seals must be individually slipped over the pipe parts, the exchange effort is very high. Furthermore, from the EP 1 630 347 B1 a seal between a rotating and a stationary tube known which uses a mechanical seal. Mechanical seals basically have the advantage of a longer service life, as long as damage to the sliding surfaces can be avoided. In order to keep the sliding surfaces of this mechanical seal as possible in contact with each other, a spring element is provided, which constantly applies a bias in the axial direction of the slip rings in operation. However, due to the high loads during drilling, the mechanical seal must be replaced after a certain time. This is then a nut-screw arrangement provided, with which the spring elements can be compressed in the axial direction to terminate the bias on the slip rings. Only then is it possible to change the seal rings. This change process is complicated and time-consuming. Furthermore, the sliding rings are individually removed or reassembled so that there is a risk that damage to the sliding surfaces will occur during assembly. It must be noted in particular that the seal between rotating and stationary flushing pipe is arranged in a bell of a derrick several meters in height and in particular external influences such as weather and temperature can negatively affect the change process, especially in increasingly inhospitable places, eg on the high seas and being drilled in cold regions of the earth. Therefore, the change must be made with great caution, despite possibly extremely adverse external circumstances, in order to avoid damage to the sliding surfaces. This also leads to a long and laborious change process.

Furthermore, from the US 4,557,489 a seal with slip rings known, which is pressure balanced. For this purpose, holes are provided either in the sliding rings in the radial direction, which lead to the outer periphery of the seal rings for pressure equalization or provided in Gleitringhalterungen holes which lead to the outer periphery of the seal rings to provide the pressure compensation. If the seal is damaged, the seal rings must be replaced separately.

It is therefore an object of the present invention to provide a seal between a rotating and a stationary flushing pipe, which allows a simple and inexpensive construction in particular a quick and secure change of the seal.

This object is achieved by a preassembled exchange insert with the features of claim 1. The dependent claims show preferred developments of the invention.

The exchange insert according to the invention of a drilling fluid device for connecting a stationary flushing pipe with a rotating flushing pipe to a borehole, in contrast, has the advantage that a change is quick and easy. In particular, it can be avoided according to the invention that damage to the seal occurs during the exchange process. The invention makes it possible to use a mechanical seal, which has a significantly longer life in comparison with the series-connected material jacks. This can minimize downtime during drilling operations. This is inventively achieved in that a preassembled insert is used with a mechanical seal assembly, which can be pre-assembled in a workshop and then replaced as a complete unit on the derrick. The changeover insert according to the invention comprises, in addition to a stationary and rotating sliding ring, two sliding ring carriers and an adjusting mechanism with a screw connection in order to permit an extension of the dimensions of the exchange insert in the axial direction after insertion of the replacement insert into the drilling fluid device in order to achieve a connection to the stationary and rotating flushing tube , Furthermore, the preassembled exchange insert comprises a connection component for an attachment of the replacement insert to the stationary flushing pipe. The axial adjustment then takes place relatively between the connection component and the other components of the exchange insert. Thus, a change (extension and shortening) of an axial length of the exchange insert can be achieved. If the seal is damaged, the axial adjustment mechanism is reset for disassembly, so that the axial length of the replacement insert is shortened and the replacement insert can be removed from the area between the stationary and rotating flushing tube and can be replaced by a new preassembled replacement insert. The replacement takes only a few minutes, so that the relatively higher costs for the complete replacement use are more than offset by the short replacement time. Another advantage of using a changeover insert is that new secondary sealing elements can be used with each new replacement insert. This can not be achieved with an exchange of only the slip rings. This also results in a reduced maintenance requirement.

In order to enable a simple assembly process and disassembly process of the preassembled replacement insert in the Bohrspüleinrichtung, the Schaubverbindung preferably comprises an outer sleeve with an internal thread and an inner sleeve with an external thread. The inner sleeve is preferably connected to the Gleitringträger the stationary seal ring. Thus, the axial length of the preassembled exchange insert can be changed by a relative adjustment between the outer sleeve and the inner sleeve via the thread, so that a secure application of the exchange insert on the stationary and rotating flushing pipe is possible. In the same way disassembly can be done by shortening the axial length of the insert by relative rotation between the outer sleeve and inner sleeve. As a result, the assembly / disassembly can be carried out easily by a fitter even in adverse weather conditions.

For safe rotating entrainment, the second slip ring carrier has at least one projection protruding in the axial direction for torque transmission from the rotating flushing pipe to the second sliding ring carrier.

More preferably, the second sliding ring carrier is formed in two parts with a first carrier part and a second carrier part, wherein the second carrier part is an alignment ring. The alignment ring is provided to align the second seal carrier in the circumferential direction. This is necessary because a rotational force is transmitted from the rotating purge pipe via the second slip ring carrier to the rotating slip ring.

Preferably, a positive connection is provided between the slide ring carrier of the rotating seal ring and the rotating rinsing pipe, for example by radially on the slide ring carrier outwardly and / or axially projecting projections which engage in corresponding recesses on the rotating rinsing pipe. As a result, alignment in the circumferential direction can be made possible quickly and easily even under the most difficult conditions.

The connection component preferably has a circumferential groove for a positive engagement with the stationary flushing pipe.

In order to avoid damage to the preassembled changeover insert during assembly or during transport of the changeover insert, the changeover insert preferably comprises a transport lock. The transport lock comprises at least one spring element in order to exert a preload on the mechanical seal assembly before final assembly of the insert. The bias is applied to the slip rings in such a way that the sliding surfaces of the seal rings abut each other safely to avoid damage to the sliding surfaces. The transport lock is arranged between the connection component to the stationary flushing pipe and the first Gleitringträger for holding the stationary seal ring. The transport lock is further configured such that no bias is exerted on the mechanical seal in the final assembled state of the removable insert during operation. This is provided, for example, by providing spring elements which no longer exert any pretensioning in the assembled state of the interchangeable insert in which an axial length of the interchangeable insert has been increased by the axial adjusting mechanism. The spring elements may for example have a correspondingly short length, so that no preload is exerted on the slip rings in the final assembled, axially extended state of the interchangeable insert. Due to the weight of the sliding ring and the weight of the first slide carrier, the stationary slide ring is still safe on the rotating seal ring.

More preferably, the first Gleitringträger, on which the stationary seal ring is disposed on its inner circumference on a shoulder. The shoulder causes the medium, which is passed through the interchangeable insert with pressure, exerts pressure on the sliding rings via the shoulder, so that a secure contact of the sliding surfaces of the sliding rings is achieved.

So that the pressure on the sliding rings does not become too strong during operation, the rotating and stationary sliding ring preferably has a chamfer on the inner circumference. The chamfer preferably ranges from an inner circumference of the sliding rings to half of a sliding ring width. Particularly preferably, the chamfers are provided on both slide rings the same.

For a particularly safe operation, the inner sleeve of the adjusting mechanism preferably has on an inner side a guide surface for the rotating sliding ring. The guide surface may be formed, for example, by providing an undercut, with a small gap between the wall of the undercut and the rotating seal ring to provide no friction between the rotating seal ring and the sleeve during operation. For smaller deflections then leads the inside of the inner sleeve, the rotating seal ring back into the non-contacting normal position.

More preferably, the adjustment mechanism of the removable insert comprises a rotation. The rotation is preferably a bolt or the like. The rotation ensures that a relative position between the outer sleeve and the inner sleeve is held securely during operation. In other words, after the adjustment of the axial length of the exchange insert, which is done by turning between the outer sleeve and inner sleeve, the position secured by the rotation. Before dismantling the rotation must of course be solved, so again a rotation between the outer sleeve and inner sleeve is possible to allow a shortening of the axial length of the exchange insert.

The rotation is particularly preferably a bolt with a arranged at the top of the bolt, spring-biased locking element, in particular a spring-loaded ball. The locking element engages at a starting position, in which the removable insert is not yet extended axially, in a first recess on the outer sleeve. This defines a basic position of the preassembled changeover insert. During pre-assembly, a fitter can easily see when the pre-assembled position has been reached. Furthermore, a second recess is provided on the outer sleeve, in which the latching element engages when the changeover insert during assembly has reached the axially extended final state, ie, the final assembly state. Thus, an indicator for a correct position of reaching the end position of the exchange insert in the mounted state is also present. These measures greatly facilitate the assembly, which, as mentioned, must be made partly under very difficult conditions due to external influences. By the spring-biased locking element, the latching during assembly and disengagement during disassembly is done automatically by the rotation between outer sleeve and inner sleeve of the screw.

The rotation lock is preferably arranged on an arm connected to the inner sleeve, wherein the outer sleeve between the arm and the inner sleeve is arranged. The inner sleeve preferably has a length in the axial direction, which is greater than a length in the axial direction of the outer sleeve. The inner sleeve furthermore preferably has an area which is elongated in the axial direction and which is set up for attaching a tool for adjusting the screw connection.

More preferably, the rotating and stationary sliding ring each have a bandage. As a result, the sliding rings can withstand high pressure loads.

Furthermore, the present invention relates to a Bohrspüleinrichtung with a preassembled changeover insert according to the invention.

Fig. 1

eine schematische Darstellung einer Bohrspüleinrichtung, in welcher ein erfindungsgemäßer vormontierter Wechseleinsatz verwendet wird,

Fig. 2

eine schematische, perspektivische Darstellung eines Wechselvorgangs des Wechseleinsatzes,

Fig. 3

eine schematische Teilschnittansicht des Wechseleinsatzes während eines ersten Montageschritts, in welchem der Wechseleinsatz in die Bohrspüleinrichtung eingeschoben ist,

Fig. 4

eine schematische Teilschnittansicht des Wechseleinsatzes, in welcher der Wechseleinsatz mit einem stationären Spülrohr verbunden ist,

Fig. 5

eine schematische Teilschnittansicht des Wechseleinsatzes während des Vorgangs des Verbindens mit einem rotierenden Spülrohr,

Fig. 6

eine schematische, perspektivische Ansicht eines Verstellrings zur Ausrichtung des Wechseleinsatzes gegenüber dem rotierenden Spülrohr,

Fig. 7

eine schematische Teilschnittansicht des Wechseleinsatzes im montierten Zustand, und

Fig. 8

eine schematische Schnittansicht des Wechseleinsatzes im montierten Zustand, wobei zur besseren Übersichtlichkeit das stationäre und rotierende Spülrohr nicht dargestellt sind.

Hereinafter, a preferred embodiment of the invention will be described in detail with reference to the accompanying drawings. In the drawing is:

Fig. 1

a schematic representation of a Bohrspüleinrichtung in which a pre-assembled insert according to the invention is used,

Fig. 2

a schematic, perspective view of a change operation of the exchange insert,

Fig. 3

a schematic partial sectional view of the exchange insert during a first assembly step, in which the removable insert is inserted into the Bohrspüleinrichtung,

Fig. 4

a schematic partial sectional view of the exchange insert, in which the removable insert is connected to a stationary flushing pipe,

Fig. 5

a schematic partial sectional view of the interchangeable insert during the process of connecting with a rotating flushing pipe,

Fig. 6

a schematic, perspective view of an adjusting ring for aligning the exchange insert relative to the rotating flushing pipe,

Fig. 7

a schematic partial sectional view of the removable insert in the assembled state, and

Fig. 8

a schematic sectional view of the changeover insert in the assembled state, with the stationary and rotating flushing pipe are not shown for clarity.

The following is with reference to the Fig. 1 to 8 a change of use 1 according to a preferred embodiment of the invention described in detail.

How out Fig. 1 it can be seen, the exchange insert 1 is used in a Bohrspüleinrichtung 100. The drilling fluid device 100 comprises a derrick 101 and is set up to introduce a flushing medium from above into a borehole 106 (arrow A). The Bohrspüleirichtung 100 includes a stationary flushing pipe 102 and a rotating Spülrohr 103, at its free end a drill head 104 is arranged. A flushing medium is introduced by means of a pump 105 via the stationary flushing pipe 102 into the rotating flushing pipe 103 and exits at the drill head 104. The flushing medium then flows on the outer circumference of the rotating flushing pipe 103 back to the surface in a separator 107 back. In the separator 107 is then from the borehole 106 purged rock and the like separated from the flushing medium, which can then be reused in a cycle.

According to the invention, a preassembled exchange insert 1 is provided, which can be completely changed. This is in Fig. 2 indicated schematically by the double arrow B. The preassembled exchange insert is thereby mounted in a gap 112 between the stationary flushing pipe 102 and the rotating flushing pipe 103. At the free end of the stationary Spülrohrs 102 while a first adapter 108 is provided and at the opposite free end of the rotating Spülrohrs 103, a second adapter 109 is provided. First and second guide arms 110, 111 are also formed on the first adapter 108, which allow easy insertion of the preassembled exchange insert 1. For this purpose, two guide elements 10, 11 are provided on the replacement insert 1 on a connection component 5. The guide elements 10, 11 lie with their underside on the rail-like guide arms 110, 111, so that the weight of the interchangeable insert 1 is carried on the guide arms 110, 111 of these after successful sliding of these and the assembly is facilitated. The connection component 5 further comprises a circumferential groove 50 for engagement with the guide arms 110, 111.

The pre-assembled exchange insert 1 according to the invention comprises, in particular from the Fig. 3 and 8th it can be seen, a mechanical seal assembly 2 with a stationary seal ring 20 and a rotating seal ring 21. Between the two seal rings, a sealing gap 26 is formed. The stationary seal ring 20 is enclosed by a first bandage 22 and the rotating seal ring 21 is enclosed by a second bandage 23.

At the stationary seal ring 20, a first chamfer 24 is also provided on the inner peripheral side and provided on the rotating seal ring 21 in a mirror-image manner to the sealing gap, a second chamfer 25. The two chamfers 24, 25 extend in the radial direction of the interchangeable insert and extend to the middle of the sliding rings 20, 21. The interchangeable insert 1 further comprises a first slide ring carrier 3, which holds the stationary slide ring 20 and a second slide ring carrier 4, which holds the rotating slide ring 21. The first slide ring carrier 3 is formed in two parts from a first carrier part 31 and a second carrier part 32. At the inner periphery of the first slide carrier 3, a shoulder 33 is also provided.

The second sliding ring carrier 4 is also formed in two parts with a first support member 41 and a second support member, which is an adjusting ring 42, and further comprises a plurality of extending in the axial direction X-X of the exchange insert 1 projections 43. The projections 43 serve to transmit a torque from the driven, rotating flushing pipe 103 via the second adapter 109 and the second sliding ring carrier 4 onto the rotating sliding ring 21.

The adjusting mechanism 6 comprises an outer sleeve 61 with an internal thread 63 and an inner sleeve 62 with an external thread 64. In this case, the internal thread 63 and the external thread 64 engage in one another and at a relative rotation between the outer sleeve 61 and the inner sleeve 62 is an elongation of the preassembled exchange insert in the axial direction XX of the adjusting mechanism 6. In Fig. 2 In this case, an initial length L1 of the preassembled exchange insert 1 is shown in the axial direction. Fig. 8 shows the fully extended axial length L2, which is longer than the initial length L1 by a length L3.

The inner sleeve 62 covers the mechanical seal 2 in the radial direction and provides a guide surface 66 for the rotating seal ring 21 on a radial outer side of the drum 23. The inner sleeve 62 also also holds the second sliding ring carrier 4 via the adjusting ring 42 of the second sliding ring carrier 4th

Furthermore, the exchange insert 1 according to the invention comprises a plurality of spring elements 7, which are arranged between the connection component 5 for connection to the stationary flushing pipe 102 and the first sliding ring carrier 3. Each spring element 7 is arranged around a pin 70 for guiding and positioning the spring elements. The spring elements 7 are arranged in pockets 51 in the connection component 5.

The spring elements 7 ensure that in nichtstmontmontierten state of the removable insert ( Fig. 2 . 3 and 4 ) a force F is exerted on the stationary slide ring 20 via the first slide ring carrier 3, so that the stationary slide ring 20 rests securely on the rotating slide ring 21 and the sliding surfaces come into contact (cf. Fig. 4 ). In the final assembled state, which in the Fig. 7 and 8th is shown, however, the spring elements 7 exert no spring force on the mechanical seal 2 from. This is achieved, for example, by appropriate design of a length of the springs 7, so that in the final assembled state of the exchange insert 1 in the drilling fluid 100 a spring spacing 71 between one end of the spring elements 7 and the connection component 5 is present, as in Fig. 8 shown.

The spring elements 7 thus form a transport lock, which exerts a permanent bias in the axial direction X-X on the mechanical seal before a final final assembly of the removable insert 1.

Furthermore, a sealing element 8 is arranged between the connection component 5 and the first sliding ring carrier 3. Furthermore, the removable insert 1 comprises a first, second, third and fourth secondary sealing element 12, 13, 14, 15. The first secondary sealing element 12 seals between the connecting component 5 and the stationary flushing pipe 102, the second secondary sealing element 13 seals between the first sliding ring carrier 3 and the stationary seal ring 20, the third secondary sealing element 14 seals between the rotating seal ring 21 and the second slide ring carrier 4 and the fourth side seal 15 seals between the second slide ring carrier 4 and the second adapter 109 to the rotating rinsing pipe 103 from.

The adjusting ring 42 of the second Gleitringträgers, which is rotatable from outside the preassembled exchange insert 1 by means of a tool at openings 9, allows alignment of the second Gleitringträgers 4 in the circumferential direction. This is necessary so that a torque transmission over in the axial direction XX protruding projections 43 from the second adapter 109 via the second slide ring carrier 4 on the rotating seal ring 21 is possible. This process is in the Fig. 5 and 6 seen.

The second adapter 109 has recesses 44 formed corresponding to the projections 43, so that a positive connection between the second adapter 109 and the adjusting ring 42 is possible.

For fixing a relative position of the adjusting mechanism 6 between the outer sleeve 61 and the inner sleeve 62, an anti-rotation 16 is further provided. The anti-rotation device 16 of this embodiment is a bolt which fixes a relative position between the outer sleeve 61 and the inner sleeve 62. The bolt comprises a spring-biased ball, which is locked in the not yet final mounted position in a first recess 67 on the outer circumference of the outer sleeve 61 ( Fig. 3 ). The rotation lock is arranged on a connected to the inner sleeve arm 69, so that the outer sleeve 61 between the arm 69 and the inner sleeve is arranged (see. Fig. 3 and 4 ). In the fully final mounted position ( Fig. 7 ), the ball is locked in a second recess 68 on the outer sleeve 61, which serves as an indicator for reaching the end position of the extended in the axial direction changeover insert. The two recesses 67, 68 are arranged on the circumference of the outer sleeve 61 by approximately one quarter turn between inner sleeve and outer sleeve. By the engagement of the ball in the recesses 67, 68 has a fitter each during the preassembly of the exchange insert an indicator of the correct position of the components inner sleeve and outer sleeve each other as well as in the final assembled position by snapping into the second recess 68. This is a safe Assembly possible even under the most difficult environmental conditions.

Since, according to the invention, the replacement insert is preassembled, the replacement insert can be completely pre-assembled in a workshop without any problem. In this case, all secondary sealing elements 12, 13, 14, 15 can be replaced in a simple manner. The transport securing means of the spring elements 7 ensures that during the Transports and installation until shortly before reaching a final installation position always a bias on the seal rings 20, 21 is applied, so that the sliding surfaces of the seal rings fit tightly against each other and damage to the sliding surfaces can be avoided. According to the invention can thus be made possible in a simple and fast way a complete change of the exchange insert with mechanical seal. This new new secondary sealing elements can be used with each replacement of the replacement insert, which results in a reduced maintenance requirements and a longer duration of use of the exchange insert. In a new replacement insert and the spring elements 7 can be replaced, if necessary. Since the spring elements 7 are arranged in the pockets 51, however, they are very well protected against the pumped medium, so that a change of the spring elements 7 is often not necessary.

The change process will be described in detail below. After the replacement insert to be replaced has been removed from the drilling fluid device 100, as shown in FIG Fig. 2 indicated, a new, preassembled replacement insert 1 inserted into the Bohrspüleinrichtung 100. Here, the new, preassembled replacement insert 1 is pushed onto the circumferential groove 50 and the guide elements 10, 11 on the two guide arms 110, 111, so that after a short Aufschiebeweg the complete weight of the interchangeable insert 1 by the guide arms 110, 111 is worn. As a result, a mounting of the exchange insert, which usually takes place at a certain height in the derrick 101, and must be executable even in very extreme weather conditions, much easier. A fitter now has to simply push the preassembled replacement insert 1 only along the guide arms 110, 111 into the assembly position. This inserted position is in Fig. 3 shown. In this case, a first distance 80 between an end face of the connection component 5 and an end face of the first adapter 108, which is arranged on the stationary flushing pipe 102, is present (cf. Fig. 3 ).

In a next step, this first distance 80 is eliminated by extending the first adapter 108 in the axial direction XX of the interchangeable insert (FIG. Fig. 3 ). in this connection The first adapter 108 comprises an outer ring 118 and an inner ring 128, between which a thread 129 is present, so that by rotating at least one of the rings, the inner ring 128 comes into contact with the connection component 5. This position is in Fig. 4 shown. As a result, a connection between the preassembled exchange insert 1 and the stationary flushing pipe 102 via the first adapter 108 is present. Since the connection is static, the first secondary sealing element 12 suffices for sealing. The axial length L1 of the preassembled interchangeable insert has not yet been changed.

In a next step, a connection is now made between the preassembled exchange insert 1 and the rotating flushing pipe 103. For this purpose, the adjusting mechanism 6 is actuated, in which the inner sleeve 62 is rotated relative to the outer sleeve 61. The inner sleeve 62 in this case also has an area exposed to the outside, in which a plurality of recesses 65 are provided for applying a tool. The inner sleeve 62 is thereby rotated relative to the outer sleeve 61 until the in Fig. 5 shown position is reached. In this position, no final connection between the preassembled exchange insert 1 and the second adapter 109 is still formed on the rotating purge pipe 103, but it still has to align the torque-transmitting mechanism between the second adapter 109 and the second slip ring carrier 4. For this purpose, the adjusting ring 42 is rotated in the circumferential direction, which is also made possible by means of an attachable from the outside of the adjusting ring 42 tool. The orientation is such that the projections 43 of the second Gleitringträgers 4 are arranged over the corresponding recesses 44 of the second adapter 109, as in Fig. 6 shown. After the alignment is done, the inner sleeve 62 of the adjusting mechanism 6 is further rotated relative to the outer sleeve 61, so that a further elongation of the removable insert 1 in the axial direction XX takes place until the connecting end position, which in Fig. 7 and 8th is shown reached (axial length L2).

Fig. 8 also shows the preassembled exchange insert in the connecting end position, for clarity, the first and second adapters 108, 109 of the stationary and rotating flushing pipe are not shown.

Due to the axial elongation of the interchangeable insert 1, the spring elements 7 can relax completely, so that the in Fig. 8 shown spring spacing 71 between the free end of the spring element 7 and the connection component 5 is present. In operation, the pressure on the slip rings is then built up via the shoulder 33. The spring elements can also be designed so that no spring distance to the connection component 5 is present, but no spring force acts more between the connection component 5 and the first slide ring carrier 4.

The spring elements 7 are arranged in correspondingly formed pockets 51 in the connection component 5.

As a last step, the anti-rotation 16 is then activated for fixing a relative position between the outer sleeve 61 and the inner sleeve 62 of the adjusting mechanism 6. Here, the ball locks the rotation in the second recess 68 a. Thus, the fitter has an indicator that the replacement insert has been extended to the correct axial length L2. Subsequently, the Bohrspüleinrichtung 100 is ready for use again.

During operation, a pressure is then exerted on the sliding rings by means of the shoulder 33 on the first slide ring carrier 3, so that a secure seal on the sealing gap 26 is possible. Depending on the application, the desired pressure level can be designed by changing the length of the chamfers 24, 25 in the radial direction of the sliding rings. In the final mounted position, the changeover insert 1 thus has an axial length extended by the length L3, starting from the axial length L1 (FIG. Fig. 2 ) to the axial length L2 ( Fig. 8 ) on.

The inventive idea of providing a preassembled replacement insert with a mechanical seal assembly 2 thus a quick and safe change, even in adverse environmental conditions can be achieved. Furthermore, the interchangeable insert 1 may allow the use of slip rings as a seal in a drilling mud device 100, so that in comparison with the prior art a significantly longer life of the seal between the rotating and stationary flushing pipe is achieved. The handling of the interchangeable insert can be carried out by a single mechanic.

By providing the circumferential groove 50 on the connection component 5, incorrect assembly is also practically impossible. In order to bring the preassembled exchange insert 1 in the end position, only two Gewindeverstellmechanismen need to be adjusted, one on the first adapter 108 on the stationary wash pipe 102, and a second on the changeover insert 1 (adjustment mechanism 6). This process can be enabled even under the most severe environmental conditions. Furthermore, it is safe to avoid damage to the slip rings during the change process, since the transport securing spring elements 7 exert a bias until shortly before reaching the final assembly position on the slip rings. Also, no handling with individual slip rings is necessary, which in the prior art often leads to serious damage to the seal rings with correspondingly reduced life of the sliding rings mounted in this way.

LIST OF REFERENCE NUMBERS

1

change insert

2

The mechanical seal assembly

3

first slip ring carrier

4

second slip ring carrier

5

connection component

6

adjustment

7

spring element

8th

sealing element

9

opening

10, 11

guide elements

12-15

In addition to sealing elements

16

twist

17

prestressed locking element

20

stationary sliding ring

21

rotating seal ring

22

first bandage

23

second bandage

24

first phase

25

second phase

26

sealing gap

31

first carrier part

32

second carrier part

33

shoulder

41

first carrier part

42

adjusting

43

head Start

44

recess

50

circumferential groove

51

bag

60

screw

61

outer sleeve

62

inner sleeve

63

inner thread

64

external thread

65

recess

66

guide surface

67

first recess

68

second recess

69

poor

70

Pin for positioning

71

spring distance

80

first distance

100

Bohrspüleinrichtung

101

derrick

102

stationary flushing pipe

103

rotating flushing pipe

104

wellhead

105

pump

106

well

107

separator

108

first adapter

109

second adapter

110, 111

guide arms

112

gap

118

outer ring

128

inner ring

129

thread

Claims (15)

A pre-assembled interchangeable insert of a drilling mud device for connecting a stationary mud tube to a rotating mud tube of a well, comprising: a mechanical seal assembly (2) having a stationary seal ring (20) and a rotating seal ring (21), a first slide ring carrier (3) on which the stationary slide ring (20) is arranged, a second slide ring carrier (4) on which the rotating slide ring (21) is arranged, a connection component (5) which is set up to connect the replacement insert to the stationary flushing pipe, and an adjusting mechanism (6) acting in the axial direction (XX) with a screw connection (60) for changing an axial length (L1, L2) of the interchangeable insert, - wherein the screw connection (60) is connected to the second sliding ring carrier (4) in the axial direction (XX) an adjustment of the second Gleitringträgers (4), the mechanical seal assembly (2) and the first Gleitringträgers (3) relative to the connection component (5) to enable. Interchangeable insert according to claim 1, characterized in that the screw connection (60) comprises an outer sleeve (61) with an internal thread (63) and an inner sleeve (62) with an external thread (64). Interchangeable insert according to one of the preceding claims, characterized in that the second sliding ring carrier (4) comprises at least one projection (43) projecting in the axial direction (XX) for torque transmission from the rotating flushing pipe to the second sliding ring carrier (4). Interchangeable insert according to claim 3, characterized in that the second Gleitringträger (4) comprises an alignment ring (42) to align the second Gleitringträger (4) in the circumferential direction. Interchangeable insert according to one of the preceding claims, characterized in that the connection component (5) has a circumferential groove (50) for a positive engagement with the stationary flushing pipe. Interchangeable insert according to one of the preceding claims, further comprising a transport lock with at least one spring element (7), which exerts a bias on the mechanical seal assembly (2) prior to a final assembly of the preassembled insert and no bias in the final assembled state of the changer on the mechanical seal (2) exercises. Interchangeable insert according to claim 6, characterized in that the transport lock between the connection member (5) and the first slide ring carrier (3) is arranged. Interchangeable insert according to one of the preceding claims, characterized in that the first sliding ring carrier (3) has a shoulder (33) arranged on its inner circumference. Interchangeable insert according to one of the preceding claims, characterized in that the stationary slide ring (20) and / or the rotating slide ring (21) on an inner periphery a chamfer (24, 25). Interchangeable insert according to one of the preceding claims, characterized in that the inner sleeve (62) of the adjusting mechanism (6) has on an inner side a guide surface (66) for the rotating sliding ring (21). Interchangeable insert according to one of the preceding claims, characterized in that the adjusting mechanism (6) has an anti-twist device (16). includes, to fix a relative position between the outer sleeve (61) and the inner sleeve (62). Interchangeable insert according to claim 11, characterized in that the anti-rotation device (16) comprises a bolt with a spring-loaded at a tip of the bolt locking element (17) which engages in a preassembled position in a first recess (67) on the outer sleeve (61) and engages in a final mounted position in a second recess (68) on the outer sleeve (61). Interchangeable insert according to claim 11 or 12, characterized in that the anti-rotation device (16) is arranged on an arm (69) connected to the inner sleeve (62), wherein the outer sleeve (61) is arranged between the arm (69) and the inner sleeve (62). is arranged. Interchangeable insert according to one of claims 2 to 13, characterized in that the inner sleeve (62) has a length in the axial direction (XX), which is greater than a length in the axial direction (XX) of the outer sleeve (61). Interchangeable insert according to claim 14, characterized in that the inner sleeve (62) has an area which is elongated in the axial direction (XX) and which is set up for attaching a tool for adjusting the screw connection (60).

Images